I am a complete noob. I just bought the 350 xt from butterflyphoto and was talked into getting the two sigma lenses instead of the standard cannon lense, and the 75-300?4-5.6III usm. The two sigmas are at this link http://www2.butterflyphoto.com/shop/product.aspx?sku=REBELLENSKIT Are these significantly better. I read the kit lense was very poor, and wanted an upgrade for a modest price. I want the best quality I can get to cover this range without spending much. I will mainly be using the camera for family, sporting, and various vacationing type events. I want great pictures when I take them, that's why I went with the SLR.